You can still do that right through the armour. It's only slightly harder.

And OW gives trolls only Inhuman Toughness, so this is actually half as effective as Claws or an applicable stunt.

Not "slightly" harder. Even Armor:1 presents a significant setback to damage dealing, and can lengthen a fight significantly on its own.

Again, the extra stress boxes are more important than the armour. Catch is still relevant.

Very arguable. Extra stress boxes might increase the amount of damage they can take, but armor can negate damage entirely. In essence, this stunt takes a character who could not damage a supernatural creature at all without doing extra research and finding specific items, and makes them a character who can literally just punch everything to death without any extra time or effort spent, unless that thing has full immunity to damage.

Put it this way: Your standard issue Red Court Vampire can take 1-shift hits indefinitely without taking damage. A human in a fist-fight with one has very little chance of defeating them at all unless they consistently beat their defenses by a wide margin.

With this stunt, the human in a fist fight only has to land six one-shift hits to win. He doesn't have to go find holy water, or arm himself in any way.

Yes, of course. That's what happens when you spend Refresh on combat stuff.

And -1 refresh is enough to straight up invalidate the defenses of a character who's had to spend far more refresh to be able to give themselves Armor:4?

A feet-in-the-water neophyte to Surtur is going to be able to punch straight through armor handcrafted by Mab's Right-Hand-Woman, that saw Harry Dresden get through an apocalyptic battle royale unscathed?

The only power that does anything close to this not only has a very restricted set of prerequisites, but also requires an additional fate point every scene it's active.

Now I'd be in favor of a stunt that can get around specific types of armor, or in specific situations. For instance, I had a player once who wanted a Rogue-ish character, so she came up with a stunt that let the character negate armor if he attacked from a successful ambush. I was fine with that, because it was narrowly tailored and made sense. She wasn't going to be simply negating armor in every single attack in every single combat just because.

Every ability needs some kind of in-story justification that makes sense. And the reasons that the various characters have armor is far too diverse to justify being able to get through all of them, in any situation, with any weapon (or even without one) with the same -1 refresh stunt.

I don't think it's appropriate for a power at all, let alone one costing as little as -1 refresh.

What's the justification for straight up ignoring any kind of equipment, magical or otherwise? What's the justification for essentially negating an entire class of powers across the board? What's the justification for removing the whole point of the Catch?

The closest thing to what you're suggesting is the Swords of the Cross, and to get that kind of effect the wielders not only need to be a specific character type and have an exceedingly rare item, but they also have to spend an additional fate point for any scene in which they want to use that power.

If I were GMing the game I would absolutely not allow a player to declare that they'll bypass any and all armor with any attack no matter what for the measly cost of -1 refresh.

Why would any character who's going into combat not take this power?

The thing to remember is that a compel is a gameplay term.

It is not a story term.

Harry isn't using magic to resist a compel. He's using magic to resist an in-story consequence of his magic.

To put it another way, Harry putting up that spell is basically him creating a block against himself hexing things; if Harry was compelled, that means that the GM holds up a fate point and goes, "Your magic shorts everything out and gets you noticed, take it or spend a fate point so it doesn't happen."

If anything, it's Harry's aspect as a wizard that's being compelled, so he couldn't invoke that same aspect to get out of it.

This feels like it could just be an aspect and compels to me.

So, I've been thinking of doing a set of videos about DFRPG explaining things about the system, inspired by video series like the Dungeon Dudes for DnD 5e.

So, what topics do you think would be useful for new players, or as rules clarifications?

The ones I have in mind are:
1. Aspects
2. What the skills do, and how the stacking system works
3. Combat and Conflicts
3a. Stress and Consequences
4. Spellcasting -- Evocation
5. Spellcasting -- Thaumaturgy
6. Powers
7. Stunts

I think, from reading Paranet Papers, the Catch for Mental Toughness works differently than for physical toughness. It's less, "Find this thing and wave it at them," and more, "This is a personal phobia or trauma that will get at their head."

So I don't think something as general as "Vanity" fits. It would have to be something particular and personal to them.

Don't forget that Peace Talks is basically half a story.

You wouldn't stop half-way through Proven Guilty and gripe that Molly hasn't gotten enough screentime, would you?

She was nearly drained, too -- when people are hungry, they don't necessarily think as rationally as they would otherwise.

Lara is near a breaking point -- Thomas nearly dead, the whole city about to be plunged into Chaos, and a mortal world aware of vampires is one that will kill her.

She's not acting like she normally would, which is the point -- this is an extraordinary circumstance even by her standards, and everyone has a breaking point.